Sprinkler base



FIG. 1 is a perspective view of a sprinkler base;

FIG. 2 is a top view of the sprinkler base of FIG. 1.

FIG. 3 is a bottom view of the sprinkler base of FIG. 1.

FIG. 4 is a front view of the sprinkler base of FIG. 1.

FIG. 5 is a rear view of the sprinkler base of FIG. 1; and,

FIG. 6 is a left side view of the sprinkler base of FIG. 1 with the right side view being a mirror image thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for sprinkler base, as shown and described. 